I've been trying to use stash first and mostly succeeding. However as you all know there's always that one fabric you don't have or don't have enough of. . .
I'm discovering that the ones I'm drawn to are focus fabrics but the ones I always need more of are the blenders and ones that play the supporting roles.
A long time ago a friend told me to always get coordinating colors at the same time (or at least the same season) or you may not be able to find the right ones later as the color pallatte changes each season. ie. the lime green from last year will be more blue or more yellow next year and won't match. Of course it will resurface five, ten, twenty years from now as the "new" color of the season. Lol!